279140 - Toolbar button images truncated during mouseover and when greyed out (if colour depth less than millions)

Status: RESOLVED DUPLICATE of bug 245407

(SeaMonkey :: Themes, defect)

Description

[Stewart Gordon]

I have just been given a new monitor (Apple Studio Display flat-panel), and ever
since noticed a strange visual glitch with the toolbar buttons.  I don't see why
the change of monitor should have led to this, but if it had been happening all
along I'm sure I would have noticed it.

Buttons that are enabled, when the mouse isn't hovering over them, look fine. 
But when I move the mouse over a button, the right-hand half of the button image
disappears.  Some of the buttons (Back and Forward) but not others (Stop and
most of the buttons in MailNews) are also cut off when greyed out.  Moreover,
the whole image appears when I am actually pressing the button.

The bug doesn't affect personal toolbar links, the little buttons on the status
bar for switching between bits of Mozilla, or any of the buttons in Composer. 
It is happening only with the Classic theme.

Comment 1

[Stewart Gordon]

Attachment: Screenshot of toolbar with truncated buttons

This shows what happens when I move the mouse over the Reload button.

Comment 2

[Stewart Gordon]

I thought that the user-agent was automatically added to the bug report even
when not using Bugzilla Helper.  But apparently not.  Well, here it is:

Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; en-US; rv:1.8b) Gecko/20050119

Comment 3

[Stefan [:stefanh]]

Stewart, what screen color depth is your monitor set to (Finder system prefs -->
Hardware --> Monitors:  choose between millions, thousands or 256 )? What
happens if you change the settings?

Comment 4

[Stewart Gordon]

It was set to thousands.  The same happens if I change it to 256, but on
millions the problem disappears.  I also tried playing about with the
resolution, which didn't make a difference.

Comment 5

[Stefan [:stefanh]]

This is a Quickdraw API issue (I reported exactly the same issue as you in bug 
254495). Fixing bug 245407 (move to Quartz APIs) should cure the problem.

*** This bug has been marked as a duplicate of 245407 ***

Comment 6

[Stewart Gordon]

Attachment: Another glitch specific to lower colour depths

The icons in message prompts screw up in a different way.  Is this part of the
same issue?